Class of insulation

Certainly! Let’s explore the different classes of electrical insulation based on their temperature capabilities:

1. Class-Y Insulation (Up to 90°C):

   • Class-Y insulations can withstand temperatures of up to 90°C. They are typically made of materials like cotton, silk, or paper.

2. Class-A Insulation (Up to 105°C):

   • Class-A insulations can handle temperatures up to 105°C. They are made of reinforced Class-Y materials impregnated with varnish or insulation oil.

3. Class-E Insulation (Up to 120°C):

   • Class-E insulations can withstand temperatures up to 120°C.

4. Class-B Insulation (Up to 130°C):

   • Class-B insulations can handle temperatures up to 130°C. They consist of inorganic material hardened with adhesives and were the first insulators to use this structure.

5. Class-F Insulation (Up to 155°C):

   • Class-F insulation can withstand temperatures up to 155°C. Examples include materials upgraded from Class-B with adhesives, silicone, and alkyd-resin varnish of higher thermal endurance.

6. Class-H Insulation (Up to 180°C):

   • Class-H insulations can handle temperatures up to 180°C. They are made of inorganic material glued with silicone resin or equivalent adhesives.

7. Class-C Insulation (Up to 180°C or Higher):

   • Class-C insulations withstand temperatures up to 180°C or higher. They are typically composed of 100% inorganic material.

In summary, electrical insulation is classified based on its maximum allowable temperature. By using insulating materials with higher thermal endurance, the size of electrical machines can be minimized.

Reference:

1: https://electricalbaba.com/electrical-insulation-classes/ “Electrical Insulation Classes - Electrical Concepts” 

2: https://en.wikipedia.org/wiki/Insulation_system “Insulation system - Wikipedia” 

3: https://www.electricalvolt.com/electrical-insulation-classes-classification-of-insulating-materials/ “Electrical Insulation Classes | Classification of Insulating Materials”